Scraping device



Feb. 21, 1928. 1,660,134

, M. MERNIT SCRAPING DEVICE Filed July 9; 1926 AM AW Patented Feb. 21, '1928.

UNITEDSTATES 1,660,134 PATENT oF-FICE.

MURRAY MERNIT, 0F NEW YORKjN. yY., ASSIGNOR 0F ONE-TENTH TO ADOLPH v FRIEDRICH, OF NEW YORKQN. Y.

SCRAPING DEVICE.

-A'pplicaton filed July 9, 1926. Serial No..121,329.

This invention relates to scraping devices and more particularly to those power driven scrapers used for the removal of wall paper. The object of my invention. isy to provide a practical power driven wall paperremoving device which is efficient in operation, y

simple in construction, light in weight so `as to make it labor saving in operation and transportion. The device consists of a hand operated tool which carries a power driven reciprocating blade or scraper. To make this hand operated tool lightin weight a power unit actuates the scraper through a light flexible shaft of suflicient length to allow the operator freedom of movement.

By this arrangementthe tool is light in ,l

vweight and easy to manipulate because the power mechanism which is usually of some weight is not .carried in the tool.

The tool is manipulated in the same manner as an ordinary scraper.' The operator inserts the cutting edge ofthe blade or knife under the edge ofthe wall paper and moves forwardly Vthe blade augmenting ,this Yforward movement by rapidly reciprocating in the same direction, thus effecting amore iapid and efficient stripping or scraping of paper from the wall.

In my invention it is advantageous to automatically prevent the reciprocation of the blade during the backward strokes ofthe tool or when the same is not-being momentarily used thus reducing the wear ofthe moving parts and reducing the amount of vibrations which have a tiring effect upon the arm of the operator. y

My preferred power unit is alight elect-ric motor which maybe carri-ed upon the body of the operator or rested upon the*` floor. When placed upon the floor it is advantageous to mount the same upon rollers, so

that it can be readily moved from place to place as the work progressses. The current for the motor may be supplied through any convenient cable.

For thepurpose of removingfthe lwall, paper which is normally beyond the reachV ofthe operator, I provide a'detachable eX- enable the operator to reach such wall paper.

I have provided readily detachable connections between the motor` the tool and the cable` to permit the changing of parts, to facilitate the transportation of vthe device and to permit thevready attachment of the elongated handle between the tool and the flexible driving connection whenever ncessary. f

Other 'objects and advantages will hereinafter appear. Referring to the drawings:

Fig. l1 illustrates the application and use of 1rlny device for removing paper from the wa Ilig 2 is a Sectional View of the scraping too Fig. 3 Vis a sectional view taken online a-a of Fig. 2..

Fig.'4 is af section on line 4-4 of Fig. 2. Fig. 5 -is a fragmentary detail perspective `'view' showing a part of the detachable connections between the motor and the cable and between the cable and the tool.

Fig. 6 is a sectional view of the detachable connection between the motor vand the cable.

Fig. 7 is a-longitudinal sectional view of the elongated handle.

Fig. 8 is an assembled elevational view showing the elongated handle in use. ,Referring to Figs. 1, 2 3 and 4 the scraping tool comprises a rectangular body or casting 1 having an open top and bottom andfhaving side walls 2 and?) extending beyond the front .and rear walls 4 and 5. The `extensions of the side walls carry grooves 6 andl 7 upon their inner faces These grooves serve to guidea slide or reciprocating plate 8 having tongues 9 and 10 engaging respectively the grooves 6 and7 which vextension carries an inclined face 12. The extensionll and its inclined face 12 are of greater width than thel part of the V.slide engaged by the grooves as-illustrated in Fig. 3, so as to carry. a wide knife` or scraper blade 13. This knife is accurately positioned upon the inclined face 12 by pins 14, l15 and 16 secured in the extension 11 and ysnugly, engaging openings 17, 18, and .19,in the knife 13. A-thumb nut 2O threaded upon the eXtendedcenter pin 15 serves to re- '.movably secure the blade upon the face so that blades may be readily interclianged.

The knife or scraper has two cutting edges formed by beveled faces 21 and-22 so that either edge may be used when the other is dulled. The forward cutting edge of the '.blade and its face 21 extend, as will be noted from Figs.A 1 and 2, beyond thelower sur- A. shaft 26 is journaled in an opening 27 in the rear wall 5 and in the handle 23 by means of a collar28'rigidly secured therein.

The ends of the shaft, Fig. 2, extendbeyond their bearings and one end carries within the body 1 a cam 29 having a cam surface 30 and the other end carries within the end of the handle a clutch member 31 having a slot 32. The cam 29 and the clutch member 31 are rigidly secured to the shaft .adjacent thebearings to hold theshaft against endwise movement. Y

The cam face 30 of the cam 29 is adapted to be engaged by a follower 33 rotatably mounted upon a vertical stud shaft 34 secured into the upper face of the slide as shown in Figs. 2` and 3. Then the shaft 26 is rotated its cam 2,9 will cause the slide 8 to reciprocate by reason of the cam face 30 acting upon the follower' 33.

The slide is normally urged forward. towards the front wall 4 by a spring 35 so as to move the follower 33 out of the range of cam face and thus prevent the reciprocation of the slide. The tension spring 35, Figs. 2 and 3, is attached at one end to a post 36 secured to thefront wall `4 and theV other end is secured to a post 37 threaded into the yond the range of the cam face 30.

The open'top of the body 1 is closed by a removable cover 39 secured Aby screws to the walls in order toprotect the moving parts from dust and grit and to form an oil chamber 'as shown in Figs.y 2 and 3.

f The shaft 26 is driven preferably by an electric motor 40 through afiexible cable 41 of substantial length as shown in Fig. 1. vThe shaft 42,Fig. 6, of themotor carries securely a clutch member 43 having a slot 44, and the hub of the motor frame carries fixed thereto a sleeve 45 ofthe same diam-eteras the tube 24 which forms the handle 23. The ends of the cable, Figs. 1, 2V

vand 7, carry securely sleeves 46 which it over the endof the handle 23 and over the y sleeve 45 secured tothe motor 40. The cable 41 loosely houses a flexible shaft 47 the ends of which are rigidly-connected to clutch members 48 rotatably mounted in the sleevesV 46. The members 48 are held against .longitudinal movement by pins 49 Xed in the sleeves 46 and engaging grooves 50 in the members/48. The members 48, F igs- 2 and 6 of the motor. The sleeves 46 carry internal shoulders 54 which abut against the ends of the handle 23 and of the sleeve 45 when the sleeves 46 are turnedy so that their pins Y 52 engage and bind in the inclinedfand -bent portions of the bayonet slots and thus cause the shoulders 54 to firmly abut against end of the handle 23 and end of the sleeve 46.

The electric motor 40, Fig. 1, inV order. tof

be carried upon' the body of the operator,

is provided with-a metal strap `55 through i which passes a belt 5,6 to be secured abouty the waist of the operator.V The motor 'isvalso provided with rollers 57 sothat it may readily be moved yabout by the operator. A

current carrying cable V58 with a switch 59 may be provided for controlling the motor.

Fig. 1 illustrates my device ready for use with thetool Yplaced against a wall 60 and the motor `40 resting uponV a floor 61. The tool is then moved forward or upward in the same manner as an ordinary scraperby mo'A means of the handle 23, with the blade 13 inserted underneath the edge of the lowermost layerof wall paper as illustratedin Fig. 2.

The forward or upward movement ofthe tool and the resistance ofthe wall paper the spring 35 and thus cause the follower 33 to be actuated by the 'eam'face 30 ofthe revolving cam 29`as shown in Fig. 2.r AtV rapid and efficient removal of wall paper by reason of the rapidly reciprocating blade 31, cutting, and scraping the paper from Ythe wall. When this forward movement 'ceases the spring 35 will move the slide forward `will move lthe slide 8 Aagainst tlietension of kand thus move the follower 33 out of range of the cam face 30 and'prevent theireciprocation of the slide.

Therefore during the backward strokesofv the tool and during momentary halts in the work the slide will not reciprocate thus reducing the wear of the parts and reducing the vibrations which would havel a tiring effect upon the arm of the operator. g l

It will be noted that the tool is lightly and simply constructed and driven by a light flexible shaft for the purpose of providing a labor saving device. In order to produce a better contact between the knife 13 and the wall, the operator presses with his free hand upon the cover of ythe device which is arranged for that purpose. The beveled face of the knife 13 serves to guide the tool and the operator may change the relation of the cuttingedge of the blade t0 the wall by moving the handle 23 to or from the wall.

This device may also be used for the removal of other materials from the walls such as paint and fabric any may also be used for scraping other surfaces than lwalls.

To extend the upward range of the tool in order to remove the wall paper normally out of the reach of the operatorI provide an elongated handle 62, Figs. 7 and 8, which can be readily attached and detached to the handle 23 of the device.

This handle consists of a tube 63, Fig. 7, rigidly carrying at one end a sleeve 64, corresponding in construction to sleeves 46, having an internal shoulder and pins 66. The other end of the tube carries a sleeve 67 resembling the end of the handle 24 and having bayonet slots 68. The sleeves 64 and 67 rotably support an elongated shaft 69 which carries at its ends, inside of the sleeves 64 and 67, clutch members 70 and 71, respectively. The clutch member 70 carries a tongue 72 and the clutch member 68 carries a slot 73. To attach this elongated handle to the handle 23 the sleeve 46 of the flexible cable 41 is first detached from the handle 23 and attached to sleeve 67 so that the clutch members 48 and 71 engage and the pins 52 engage the bayonet slots 68. Then the sleeve 64 of the elongated handle 59 is slipped over the end of the handleV 23 with the clutches engaging and its pins 66 binding in the bayonet slots 53. In this way this extension serves'as a handle and also as a transmitter of the power as shown in Fig. 8. v

' It will be noted that the connections between the handle 23 and the cable 41, the cable 41 and the motor 40 are readily detachable to permit the changing of parts. These connections also permit the ready incorporation of the elongated handle.

It is understood that the form and construction of the device may be varied without departing from the spirit and the scope of my invention as defined in the following claims.

What I claim is:

body portion, a cam carried by the shaft, a

follower mounted upon the slide and adapted to be actuated by the cam so as to cause the slide to reciprocate, a means constantly acting upon the slide to move the follower out of the range of the cam.`

2. In a scraping device the combination of a body portion, a'reciprocal slide carried by said body portion, a cutting edge carried by said slide, a rotating shaft journaled in said body portion, coacting means upon the shaft and upon the slide for causing the shaft to reciprocate the slide, a means acting upon the slide to normally prevent the first saidA n means from reciprocating the slide.

3. In a scraping device the combination of a body portion, a reciprocal slide carried by the body portion, a cutting edge carried by the slide, a rotating shaft carried by the body portion, coacting means upon the slide and shaft -for causing the slide to reciprocate, means for normally preventing the reciprocation of the slide.

4. In a scraping device the combination of a body portion, a reciprocal slide carried by said body portion, a cutting edge carriedby the slide, a rotating shaft journaled in the body portion, a cam carried by the shaft, a follower carried by the slide and adapted to be engaged by the cam to reciprocatethe slide, a spring acting upon the slide to move the follower out of the range of the cam. l

5. In a scraping device comprising a body portion having an vopen top and bottom and having side walls extending beyond the front and rear walls, grooves cut into the extensions of the side walls, a slide closing the bottom of the body portion guided by the grooves and having an extension pro jecting beyond the front wall, a knife carried by the extension, a follower carried by the slide, a handle carried bv the rear wall of the body portion by which the same is manipulated, a rotatable shaft journaled in the handle and rear wall of the body portion, a cam carried by the shaft for actuating the follower, and a cover for closing the top of the body portion and for forming a rest for a hand of the manipulator.

Signed at New York city in the county of New York and the State of New York, this 6thl day of July, 1926.

MURRAY MERNIT.

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